<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>留言板</title>
  <style>
    .container {
      width: 350px;
      height: 300px;
      margin: 0 auto;
      /* border: 1px black solid; */
      text-align: center;
    }

    .grey {
      color: grey;
    }

    .container .row {
      width: 350px;
      height: 40px;

      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .container .row input {
      width: 260px;
      height: 30px;
    }

    #submit {
      width: 350px;
      height: 40px;
      background-color: orange;
      color: white;
      border: none;
      margin: 10px;
      border-radius: 5px;
      font-size: 20px;
    }
  </style>
</head>

<body>
<div class="container">
  <h1>留言板</h1>
  <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
  <div class="row">
    <span>谁:</span> <input type="text" name="" id="from">
  </div>
  <div class="row">
    <span>对谁:</span> <input type="text" name="" id="to">
  </div>
  <div class="row">
    <span>说什么:</span> <input type="text" name="" id="say">
  </div>
  <input type="button" value="提交" id="submit" onclick="submit()">
  <!-- <div>A 对 B 说: hello</div> -->
</div>

<script src="js/jquery-3.7.1.min.js"></script>
<script>
  load();

  function load() {
    $.ajax({
      type: "get",
      url: "/message/getList",
      success: function (messages) {
        if (messages != null && messages.length > 0) {
          var finalHtml = "";
          for (var m of messages) {
            finalHtml += "<div>" + m.from + "对" + m.to + "说:" + m.message + "</div>";
          }
          $(".container").append(finalHtml);
        }

      }
    });
  }

  function submit() {
    //1. 获取留言的内容
    var from = $('#from').val();
    var to = $('#to').val();
    var say = $('#say').val();
    if (from == '' || to == '' || say == '') {
      return;
    }
    var data = {
      from: from,
      to: to,
      message: say
    };

    $.ajax({
      type: "post",
      url: "/message/publish",
      contentType: "application/json",
      data: JSON.stringify(data),
      success: function (result) {

        var jsonObj = JSON.parse(result);

        if (jsonObj.ok == 1) {
          //成功
          //2. 构造节点
          var divE = "<div>" + from + "对" + to + "说:" + say + "</div>";
          //3. 把节点添加到页面上
          $(".container").append(divE);

          //4. 清空输入框的值
          $('#from').val("");
          $('#to').val("");
          $('#say').val("");
        } else {
          //失败
          alert("留言发布失败");
        }
      }

    });



  }

</script>
</body>

</html>